He [Wiernicki] was a cadet at military school and was 14 when Germany invaded his country [Poland]. He fled into the forests with a band of older cadets and for the next four years fought in guerrilla units, launching hit-and-run attacks.

He was captured by the [German] Gestapo in a mass round-up in 1943 at a railway station and sent to Auschwitz for having false identification papers. Had the Gestapo known he was a partisan fighter, [illegal combatant] he would doubtless have been shot.

[…]

Shortly before Auschwitz was liberated [on Jan. 27, 1945], Wiernicki was transferred to Buchenwald in Germany. He escaped while being marched to yet another camp, and was not yet 20 when Germany surrendered.

Wars are fought on the battlefield, unless you are fighting against Germany. Then it is O.K. to fight as an illegal combatant, or partisan.

The Nazis acted in Poland with the hatred against Poles and Jews that called the guerrilla.
By the way, in 1942 Schellenberg received a report about a meeting at New York, attendend by Mrs Eleanore Roosewelt, about the opportunity to have the Jewish workers join the Polish resistance, a sort of a Jewish Armt. The result had been that even the Jewish workers of German military workshops had been sent to the Dead Camps. Himmler did not explain his order and the Wehrmacht commander of Warshaw who had moved objection had been replaced. Last century war had not been faught only on the battlefield but also inducing revolts or guerrillas.

It is noteworthy that the Government of Poland never signed a formal surrender. So Polish soldiers who continued to combatt were regular combattants. Entire Poland was a battlefield. You in USA are too severe fault finders. Clear?